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Related Concept Videos

Contact-dependent Signaling01:19

Contact-dependent Signaling

Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
In animal cells, gap junctions are formed...
Contact Angle01:13

Contact Angle

When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive force...
Transmission-based Precautions I: Contact, Enteric, and Droplets01:17

Transmission-based Precautions I: Contact, Enteric, and Droplets

Transmission-based precautions are for patients known to be infected or suspected to be infected or colonized with organisms that pose a significant risk to others. Some transmission-based precautions include contact, enteric, and droplet.
Contact Precautions:
Contact precautions are the measures taken to prevent the transmission of infectious agents, especially epidemiologically important microorganisms such as MRSA or influenza, primarily transmitted through direct or indirect contact with an...
Electrostatic Boundary Conditions01:16

Electrostatic Boundary Conditions

Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
Transmission-based Precautions II: Airborne and Protective Environment01:25

Transmission-based Precautions II: Airborne and Protective Environment

Transmission-based precautions are for patients infected or suspected to be infected (or colonized) with organisms posing a significant risk to others. The transmission precautions include airborne and protective environment precautions.
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Related Experiment Video

Updated: May 25, 2026

Title Cell Encapsulation by Droplets
13:10

Title Cell Encapsulation by Droplets

Published on: October 1, 2007

Contact is repulsive, but please note the "enclosed".

Robert W Burgess1, Andrew M Garrett, Abigail L D Tadenev

  • 1The Jackson Laboratory, Bar Harbor, ME 04609, USA. robert.burgess@jax.org

Developmental Cell
|January 24, 2012
PubMed
Summary
This summary is machine-generated.

Neuronal dendrites avoid self-crossing through contact-dependent mechanisms. Integrin adhesion to the extracellular matrix restricts dendrites to 2D space, optimizing this self-avoidance for efficient neuronal structure.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Developmental Biology

Background:

  • Neuronal dendrite arborization models previously proposed contact-dependent self-avoidance to prevent branch self-crossing.
  • The precise mechanisms governing dendritic self-avoidance and spatial organization remained incompletely understood.

Discussion:

  • Integrin-mediated adhesion to the extracellular matrix plays a crucial role in restricting neuronal dendrites to a two-dimensional plane.
  • This 2D restriction optimizes the efficacy of contact-dependent self-avoidance mechanisms, preventing dendrite self-crossing.

Key Insights:

  • Integrin-mediated adhesion to the extracellular matrix is a key factor in regulating dendrite morphology.
  • The extracellular matrix environment influences neuronal wiring and prevents aberrant self-interactions.
  • This study provides a refined model for understanding how neuronal structures achieve precise arborization.

Outlook:

  • Further investigation into the specific integrin subtypes and extracellular matrix components involved.
  • Exploring the implications of 2D dendritic growth in different neuronal populations and species.
  • Investigating potential therapeutic targets for neurological disorders involving aberrant neuronal wiring.